I have a laptop with a Intel Pro Wireless BG2200 built in and it connects to a Linksys W54G router, which uses a Belkin 4 Port VoIP ADSL router as a gateway. When I try and browse the web pages will often be slow to load or will suddenly become unavailable (just did it as I was trying to review this question and I had to start again). However when I use the company VPN from the same location and with the same hardware I don't have those problems. Also, the other desktops that connect wired or wirelessly to the same hardware do not have this problem. My feeling is that it is DNS related but I can't set a static DNS because I am always on the move and hook up to multiple access points around town.